I've constructed an InfoPath 2010 form that submits to DBXL using SubmitDocumentAsUser. I've configured it as what looks like the exact settings as two other forms I currently have properly working. The form posts to a library depending on a status value in the form. The data value is promoted to the library via a content type, the path to the content type is correct, and everything else looks identical relative to the respective libraries. I don't understand what's missing.
Here's the error message on the server:
Form submission failed. (User: , Form Name: POCRequest, IP: , Request: , Form ID: urn:schemas-microsoft-com:office:infopath:POCRequest:-myXSD-2013-02-04T19-12-58, Type: DataAdapterException, Exception Message: The remote server returned an error: (400) Bad Request.
The remote server returned an error: (400) Bad Request.)